Added 1-Wire temperature sensor function (#31)

src/AppLayer.cpp

@@ -50,6 +50,7 @@
 // 20240427 Added BLE configuration/status via LoRaWAN
 // 20240507 Added configuration of max_sensors/rx_flags via LoRaWAN
 // 20240508 Added configuration of en_decoders via LoRaWAN
+// 20240515 Added getOneWireTemperature()
 //
 //
 // ToDo:
@@ -59,6 +60,46 @@
 
 #include "AppLayer.h"
 
+#ifdef ONEWIRE_EN
+    // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
+    static OneWire oneWire(PIN_ONEWIRE_BUS); //!< OneWire bus
+
+    // Pass our oneWire reference to Dallas Temperature.
+    static DallasTemperature owTempSensors(&oneWire); //!< Dallas temperature sensors connected to OneWire bus
+#endif
+
+#ifdef ONEWIRE_EN
+    /*!
+     * \brief Get temperature from Maxim OneWire Sensor
+     *
+     * \param index sensor index
+     *
+     * \returns temperature in degrees Celsius or DEVICE_DISCONNECTED_C
+     */
+    float
+    AppLayer::getOneWireTemperature(uint8_t index)
+    {
+        // Call sensors.requestTemperatures() to issue a global temperature
+        // request to all devices on the bus
+        owTempSensors.requestTemperatures();
+
+        // Get temperature by index
+        float tempC = owTempSensors.getTempCByIndex(index);
+
+        // Check if reading was successful
+        if (tempC != DEVICE_DISCONNECTED_C)
+        {
+            log_d("Temperature = %.2f°C", tempC);
+        }
+        else
+        {
+            log_d("Error: Could not read temperature data");
+        }
+
+        return tempC;
+    };
+#endif
+
 uint8_t
 AppLayer::decodeDownlink(uint8_t port, uint8_t *payload, size_t size)
 {
@@ -395,6 +436,8 @@ void AppLayer::getPayloadStage1(uint8_t port, LoraEncoder &encoder)
 #endif
 
 #ifdef ONEWIRE_EN
+    float water_temp_c = getOneWireTemperature();
+
     // Debug output for auxiliary sensors/voltages
     if (water_temp_c != DEVICE_DISCONNECTED_C)
     {
@@ -732,4 +775,4 @@ std::vector<std::string> AppLayer::getBleAddr(void)
 
     return bleAddr;
 }
-#endif
+#endif

src/AppLayer.h

@@ -38,6 +38,7 @@
 // 20240424 Fixed BLE address initialization from Preferences, added begin()
 // 20240426 Moved bleAddrInit() out of begin()
 // 20240504 Added BresserWeatherSensorLWCmd.h
+// 20240515 Added getOneWireTemperature()
 //
 // ToDo:
 // -
@@ -121,14 +122,6 @@ class AppLayer
     Lightning lightningProc;
 #endif
 
-#ifdef ONEWIRE_EN
-    // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
-    OneWire oneWire(PIN_ONEWIRE_BUS); //!< OneWire bus
-
-    // Pass our oneWire reference to Dallas Temperature.
-    DallasTemperature temp_sensors(&oneWire); //!< Dallas temperature sensors connected to OneWire bus
-#endif
-
 #ifdef DISTANCESENSOR_EN
 #if defined(ESP32)
     /// Ultrasonic distance sensor
@@ -176,7 +169,7 @@ class AppLayer
      *
      * If available, addresses from Preferences are used, otherwise defaults from
      * BresserWeatherSensorLWCfg.h.
-     * 
+     *
      * BleSensors() requires Preferences, which uses the Flash FS,
      * which is not available before the sketches' begin() is called -
      * thus the following cannot be handled by the constructor!
@@ -191,11 +184,13 @@ class AppLayer
             // No addresses stored in Preferences, use default
             knownBLEAddresses = knownBLEAddressesDef;
             log_d("Using BLE addresses from BresserWeatherSensorLWCfg.h:");
-        } else {
+        }
+        else
+        {
             log_d("Using BLE addresses from Preferences:");
         }
         bleSensors = BleSensors(knownBLEAddresses);
-        
+
         for (const std::string &s : knownBLEAddresses)
         {
             (void)s;
@@ -204,6 +199,17 @@ class AppLayer
 #endif
     };
 
+#ifdef ONEWIRE_EN
+    /*!
+     * \brief Get temperature from Maxim OneWire Sensor
+     *
+     * \param index sensor index
+     *
+     * \returns temperature in degrees Celsius or DEVICE_DISCONNECTED_C
+     */
+    float
+    getOneWireTemperature(uint8_t index = 0);
+#endif
 
     /*!
      * \brief Decode app layer specific downlink messages